Description:
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A stream can only be referenced as <scheme>://<target> so URL like "about:config" can not be used. Yet, according to the RFC 3986, the double slash should only appear if what follows is a hiearchical structure (see bug #32535).
I have read in the compression streams documentation that this is not allowed to prevent ambiguities with filenames containing ':'.
I suggest to reverse this behavior : allowing URL such as about:config and setting a limitation in local files access. Users can easily take off the ambiguities by using "./foo:bar" instead of "foo:bar".